Dear Researchers,
Fineness test on cement can be determined by using 75 microns sieve. Please reply.
Thanks with Regard,
Hari.N
IS:4031 has detailed explanation for how to find fineness of cement by dry sieving with 90 micron sieve. 10 percent of cement content should not be greater than 90 micron.
As per IS 4031 (Part1)-1996, the procedure to find the fineness of cement by sieving is done by taking 90 micron sieve, so according to IS standards 90 micron sieve is the standard sieve.
Yes, but I would not recommend it, use Blain test method. It is the most accurate.
It is one of the tests there are other high end tests such as Brunauer–Emmett–Teller (BET) theory aims to explain the physical adsorption of gas molecules on a solid surface and serves as the basis for an important analysis technique for the measurement of the specific surface area of powder.
Blain method is the most appropriate for determination of finess of cement
Though 90 micron sieve is used for determination of fineness of cement, 75 micron sieve can be suggested for very fine cement. Then comparing residue left on 90 micron sieve and also 75 micron sieve fineness of " very fine cement" can be interpreted.
The optimum value is 90 micron that if the particle size is greater than that, the interaction (full hydration) between cement and water does not occur, and what is less is acceptable.
Role of fine particles ( less than 90 microns) of cement will play more important role in hydration , gel formation, permeability and strength of cement concrete. Hence , particles retained on 75 micron I S Sieve size should be considered for assessing fineness of cement.
In case of crushed sand, percentage of particles passing through IS sieve 75 micron size is restricted to 15 %. . Table from IS 383 is attached here. The reason is that higher percentage will interfere hydration process of cement, reduce workability, and hence cement demand will increase.
Very fine particles in cement will help in improving hydration process, workability. Normally, most of the available portland cements have fineness in the range of 3 % to 7 %. . Hence, percentage of cement particles retained on 75 microns sieve as well as 90 micron sieve need to be considered to categorize cement as very fine cement.
Particles retained on 75 micron can be considered in this test.
You can find more details about fineness of cement here
https://civilread.com/fineness-test-cement/
I agree with Indian standard less than 90 microns . Because you can check your sample from absorption point of view
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